Femur Bone

Last crawled date: 1 year, 10 months ago

Femur Bone (with main whole or cavity)

Prepared by Digital Imaging (DI) (CMM Optical) and CT scan (CT Imaging)
Human specimen’s properties for these femoral bones are:
Femur 1: Male, Left leg, Age 44, Death 2016, Weigh 85 (kg), Height 185 (cm) (original scale)
Femur 2: Male, Left leg, Age 69, Death 2015, Weigh 79 (kg), Height 188 (cm) (original scale)

To model the bone in FE software, the Femur 1 and 2 were subjected to the 3D digital imaging (CMM optical 2015, made by GOM Co., Germany with VDA calibration). The digitized model was first modeled as a shell using the cloud points, (i.e. STEP format, in CATIA V5/R21) and then converted to a solid model. It should be mentioned that in this study, the trabecular or marrow bones are not included in finite element model. To model the central cavity and inner layer of the bone, a precise method using the CT scan data is used (Spiral CT scan, ID.NO: ASMA 951355-3801, modern AZMA Co. Siemens, SOMATOM plus4). In this method, the bone is fully scanned and then an array of sections with 10 mm distances with respect to each other are created using the Marco PACS software. The absolute distance of each section from the top of the Femur is used to define the exact coordinate of the sections. All sections are stored in two-dimensional with digital imaging in communication in medicine (DICOM) format and are visualized in Adobe Photoshop CC. Finally, the three-dimensional model of the original Femur along with the 2D images of cross sections are transferred into SolidWorks 2013 software using the exact coordinates of cross sections and the cavity of the bone is modeled using the lofted cut module of the software. Using this method the bone is modeled completely precision of 0.1 mm. Since in this article the critical buckling load of the bone shaft is studied, the proximal and distal regions of Femur are excluded from the model.